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the sound the motor makes is determined by the type of mufflers and the air flow of the motor. There some missing information in the question. went from single to dual. catalytic converters still in line. Air flow is the amount/speed of air throught the intake verses the amount and speed of the exhaust. when you make exhaust changes in intake should also be looked at. One other thing to take not of is that the 305 engines were produced in both Canada and the us. You can tell the difference on the VIN number. H, and C, in the vin. I think but I am not sure which is which, but I think the H is the Canadian motor. This is a good thing, better air flow. the pollution standards are different in Canada. The The flowmasters, depending on the model can take some type for them to "burn in" to open up the exhaust. If you want to know if the changes are making any other difference, check your gas mileage. The sound you get is also determined by the size of the pipes. hope it helps. duboff

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Q: You recently installed dual exhaust on your 88 Chevy caprice from the cat back why does it still sound like stock it has a 305 in it with Flowmasters?
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